package com.example.yls.myapplication;

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.Point;
import android.os.Bundle;
import android.os.Parcelable;
import android.support.annotation.Nullable;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;
import android.widget.Toast;

import java.util.ArrayList;
import java.util.List;

/**
 * Created by yls on 2018/6/13.
 */

public class BackgroundView extends View{
    private  int mPanelWidth;
    private float mLineHeight;
    private int MAX_LINE=10;
    private int MAX_COUNT_IN_LINE=5;

    private Bitmap mWhitePiece;
    private Bitmap mBlackPiece;

    private float ratioPieceOfLineHeight=3*1.0f/4;

    private  boolean mIsWhite=true;
    private ArrayList<Point> mWhiteArray=new ArrayList<>();
    private ArrayList<Point> mBlackArray=new ArrayList<>();

    private boolean mIsGameOver;
    private boolean mIsWhiteWinnner;

    private Paint mPaint=new Paint();
    public BackgroundView(Context context, @Nullable AttributeSet attrs) {
        super(context, attrs);
        setBackgroundColor(0x44ff0000);
        init();
    }

    private void init() {
        mPaint.setColor(0x88000000);
        mPaint.setAntiAlias(true);
        mPaint.setDither(true);
        mPaint.setStyle(Paint.Style.STROKE);

        mWhitePiece= BitmapFactory.decodeResource(getResources(),R.drawable.stone_w2);
        mBlackPiece= BitmapFactory.decodeResource(getResources(),R.drawable.stone_b1);

    }


    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
        int widthSize=MeasureSpec.getSize(widthMeasureSpec);
        int widthMode=MeasureSpec.getMode(widthMeasureSpec);

        int heightSize=MeasureSpec.getSize(heightMeasureSpec);
        int heightMode=MeasureSpec.getMode(heightMeasureSpec);

        int width=Math.min(widthSize,heightSize);
        if (widthMode==MeasureSpec.UNSPECIFIED){
            width=heightSize;
        }else  if(heightMode==MeasureSpec.UNSPECIFIED){
            width=widthSize;
        }
        setMeasuredDimension(width,width);

    }

    @Override
    protected void onSizeChanged(int w, int h, int oldw, int oldh) {
        super.onSizeChanged(w, h, oldw, oldh);
        mPanelWidth=w;
        mLineHeight=mPanelWidth*1.0f/MAX_LINE;

        int pieceWidth= (int) (mPanelWidth*1.0f/MAX_LINE);

        mWhitePiece=Bitmap.createScaledBitmap(mWhitePiece,pieceWidth,pieceWidth,false);
        mBlackPiece=Bitmap.createScaledBitmap(mBlackPiece,pieceWidth,pieceWidth,true);
    }

    @Override
    public boolean onTouchEvent(MotionEvent event) {
        if(mIsGameOver) return false;
        int action=event.getAction();
        if(action==MotionEvent.ACTION_UP){
            int x= (int) event.getX();
            int y= (int) event.getY();
            Point p=getValidPoint(x,y);
            if (mWhiteArray.contains(p)||mBlackArray.contains(p)){
                return false;
            }
            if(mIsWhite){
                mWhiteArray.add(p);
            }else{
                mBlackArray.add(p);
            }
            invalidate();
            mIsWhite=!mIsWhite;
            return true;
        }
        return true;
    }

    private Point getValidPoint(int x, int y) {
        return new Point((int) (x/mLineHeight),(int)(y/mLineHeight));
    }

    @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);
        drawBoard(canvas);
        drawPieces(canvas);
        checkGameOver();
    }

    private void checkGameOver() {

        boolean whiteWin=checkFiveInLine(mWhiteArray);
        boolean blackWin=checkFiveInLine(mBlackArray);
        if (whiteWin||blackWin){
            mIsGameOver=true;
            mIsWhiteWinnner=whiteWin;
            String text=mIsWhiteWinnner?"白棋胜利":"黑棋胜利";
            Toast.makeText(getContext(),
                    text,
                    Toast.LENGTH_SHORT).show();
        }
    }

    private boolean checkFiveInLine(List<Point> points) {
        for(Point p:points){
            int x=p.x;
            int y=p.y;
            boolean win=checkHorizontal(x,y,points);
            if (win) return true;
            win=checkVertical(x,y,points);
            if (win) return true;
            win=checkLeftDiagonal(x,y,points);
            if (win) return true;
            win=checkRightDiagonal(x,y,points);
        }
        return false;
    }

    private boolean checkHorizontal(int x, int y, List<Point> points) {
        int count=1;
        for(int i=1;i<MAX_COUNT_IN_LINE;i++){
            if(points.contains(new Point(x-i,y))){
                count++;
            }else {
                break;
            }
        }
        if(count==MAX_COUNT_IN_LINE) return true;
        for(int i=1;i<MAX_COUNT_IN_LINE;i++){
            if(points.contains(new Point(x+i,y))){
                count++;
            }else {
                break;
            }
        }
        if(count==MAX_COUNT_IN_LINE) return true;
        return  false;
    }

    private boolean checkVertical(int x, int y, List<Point> points) {
        int count=1;
        for(int i=1;i<MAX_COUNT_IN_LINE;i++){
            if(points.contains(new Point(x,y-i))){
                count++;
            }else {
                break;
            }
        }
        if(count==MAX_COUNT_IN_LINE) return true;
        for(int i=1;i<MAX_COUNT_IN_LINE;i++){
            if(points.contains(new Point(x,y+i))){
                count++;
            }else {
                break;
            }
        }
        if(count==MAX_COUNT_IN_LINE) return true;
        return  false;
    }
    private boolean checkLeftDiagonal(int x, int y, List<Point> points) {
        int count=1;
        for(int i=1;i<MAX_COUNT_IN_LINE;i++){
            if(points.contains(new Point(x-i,y+i))){
                count++;
            }else {
                break;
            }
        }
        if(count==MAX_COUNT_IN_LINE) return true;
        for(int i=1;i<MAX_COUNT_IN_LINE;i++){
            if(points.contains(new Point(x+i,y-i))){
                count++;
            }else {
                break;
            }
        }
        if(count==MAX_COUNT_IN_LINE) return true;
        return  false;
    }
    private boolean checkRightDiagonal(int x, int y, List<Point> points) {
        int count=1;
        for(int i=1;i<MAX_COUNT_IN_LINE;i++){
            if(points.contains(new Point(x-i,y-i))){
                count++;
            }else {
                break;
            }
        }
        if(count==MAX_COUNT_IN_LINE) return true;
        for(int i=1;i<MAX_COUNT_IN_LINE;i++){
            if(points.contains(new Point(x+i,y+i))){
                count++;
            }else {
                break;
            }
        }
        if(count==MAX_COUNT_IN_LINE) return true;
        return  false;
    }
    private void drawPieces(Canvas canvas) {
        for(int i=0,n=mWhiteArray.size();i<n;i++){
            Point whitePoint=mWhiteArray.get(i);
            canvas.drawBitmap(mWhitePiece,
                    (whitePoint.x+(1-ratioPieceOfLineHeight)/2)*mLineHeight,
                    (whitePoint.y+(1-ratioPieceOfLineHeight)/2)*mLineHeight,null);
        }
        for(int i=0,n=mBlackArray.size();i<n;i++){
            Point BlackPoint=mBlackArray.get(i);
            canvas.drawBitmap(mBlackPiece,
                    (BlackPoint.x+(1-ratioPieceOfLineHeight)/2)*mLineHeight,
                    (BlackPoint.y+(1-ratioPieceOfLineHeight)/2)*mLineHeight,null);
        }
    }

    private void drawBoard(Canvas canvas) {
        int w=mPanelWidth;
        float lineHeight=mLineHeight;

        for(int i=0;i<MAX_LINE;i++) {
            int startX = (int) (lineHeight / 2);
            int endX = (int) (w - lineHeight / 2);
            int y = (int) ((0.5 + i) * lineHeight);
            canvas.drawLine(startX, y,endX, y, mPaint);
            canvas.drawLine(y, startX,y, endX, mPaint);
    }

    }
    public void start(){
        mWhiteArray.clear();
        mBlackArray.clear();
        mIsGameOver=false;
        mIsWhiteWinnner=false;
        invalidate();
    }
    private  static final String INSTANCE="instance";
    private static final String INSTANCE_GAME_OVER="instance_game_over";
    private static final String INSTANCE_WHITE_ARRAY="instance_white_array";
    private static final String INSTANCE_BLACK_ARRAY="instance_black_array";

    @Nullable
    @Override
    protected Parcelable onSaveInstanceState() {
        Bundle bundle=new Bundle();
        bundle.putParcelable(INSTANCE,super.onSaveInstanceState());
        bundle.putBoolean(INSTANCE_GAME_OVER,mIsGameOver);
        bundle.putParcelableArrayList(INSTANCE_WHITE_ARRAY,mWhiteArray);
        bundle.putParcelableArrayList(INSTANCE_BLACK_ARRAY,mBlackArray);
        return super.onSaveInstanceState();
    }
    @Override
    protected void onRestoreInstanceState(Parcelable state) {
        if (state instanceof  Bundle){
            Bundle bundle=(Bundle) state;
            mIsGameOver=bundle.getBoolean(INSTANCE_GAME_OVER);
            mWhiteArray=bundle.getParcelableArrayList(INSTANCE_WHITE_ARRAY);
            mBlackArray=bundle.getParcelableArrayList(INSTANCE_BLACK_ARRAY);
            super.onRestoreInstanceState(bundle.getParcelable(INSTANCE));
            return ;
        }
        super.onRestoreInstanceState(state);
    }
}
